Any recommendations of a light box to use for viewing slides?

I have a friend that has hundreds, possibly thousands of slides to sort.  He's a quadriplegic and is limited to only being able to speak or hear.  He has no use of hands or arms so it will be his wife that lays these on the box for him to see which ones to save.

I thought I'd get this for him rather than them using one of those little slide copiers which go one at a time. 

I was thinking something in the $50 range.

Do any of you have any experience with these?  I saw this one at Amazon and it was on a list at digitalcameraworld as a Digital Camera World recommended

https://www.amazon.com/dp/B00J3NRAV2?tag=georiot-us-default-20&th=1&psc=1&ascsubtag=dcw-us-6162116327615410000-20&geniuslink=true

Others run over and way over $100